Rotary cutter head for sewer rods



March 18, 1952 A. P. KJERULFF 2,589,556

ROTARY CUTTER HEAD FOR SEWER ROD$ Filed June 30, 1945 I 3mm O flagemzff Patented Mar. 18, 1952 'UNITED sTArE-s PATENT orrice ROTARY ,QUFIJ'I ER HEAD SEWER RODS i'mitolfPgKjcrulfl, Lake .Charlesllza.

1 Application June? 30, 194'5i'SeriaiNo; 602,610 1.0mm. (cinema-.3)

This invention relatesqtorsewenrods. vAn object'of the invention istheprovisionaof a .head for sewer rods, in which cutters ares-rotatably; mounted on a: support inisuchrra :manner thatportions of the periphery:oftsthescutters.will

be substantially in contact with geach-iotherzso that the inner faces of the cutters'ziwillsiormsa acute angle with each other. 1' Another object of the inventionisitheprovisionof a head forsewer'xrodsiin whichaaztriangularly' shaped support. hasna pair off; inclined :side walls with the innerflat'faces-of;roller;. cut- .ters. being mounted .on the:side walls:sOLthatipor- .tions of the peripheriesofxthe zcutters willzr-besubstantially in contacirat: theroutergerrdmfi-the Ihead, the support and :rod. having :cooperating means for connecting the-supportztoztheirodssaid support being provided -:-with. inwardly :idisposed stationary cutters having roundsharpenedze'dges facing rearwardly for cutting roots or other matter which clog the sewer.

A further object of the invention is the provision of a head-for-sewerrrods-:in" which raj-triangularly shaped support has-ymounted onithe side edges thereof, cutters provided-with circular flat inner faces inclined at an angle to each other with portions of the peripheries of the flatffaces being substantially in contactat the outer end of the head, the outer faces of the cutters'beingsections ofa sphere or variations thereof,-a'"hollow shank projecting inwardly from the baserof'tthe support and provided with stationary'cutterswxtending radially therefromwith" the innerfedges of the cutters being curvedan'd- 'sharpenedia'rod having a reduced portion received within the hollow shankwith meansfor=removablyconnecting the-reduced portion; to thesupport; said; support being-provided with cutters extendingrearwardly toward the rod and penetrating an obstruction in the sewer so that it may be removed from the sewer when the rod is withdrawn from the sewer.

This invention will be best understood froma consideration of the following detailed description, in view of the accompanying drawings forming a part of the specification; nevertheless, it is to be understood that the invention is not confined to the disclosure, being susceptible of such changes and modifications as define no material departure from the salient features of the invention as expressed in the appended claim.

In the drawings:

Fig. 1 is a plan view partly in section of a sewer head constructed according to the principles of my invention.

.2 lzFig'.i'i2r-is,=a.view similarto that shown. in.Eig..j1, 'huttumed .at90ito. said View.

{Eig a modified form of connecting. member eroda-ndthe. head. *lr igyzi-issaplan viewof. a furtherrmodified foim 1 of--t he:head,:partly'section. V Referringv more a particularly to the drawings, .LFigshl; and 2, l0 designates a triangularly shaped support whichrhas .a base portion ll and;-side loxwal-ls i2 nclined -.tow ard each. other-and termihating ,in ;;a .;roundedapex I-3. vIn',=other --words,

:thesupport [D isan; cpenframework. :Each' inc1ined:,-side-wall I 2. of the; supportivhas .mounted' thereon an: approximately semi sphericallishapedxzutter It with the innercircular ?flatirace; l Grin-engagement witha side wall: or. bar "of the .:support. .gAn :axle I! is ,5 received :by 1- an .iaxiall'yrrdisposed:passage IBiinthe-cutter I5. -Ihe raxlei-haszreduced portions I 9 and: 2fl'srespectively, ZZO- atits innerrand. outer ends. The; reduced portion it passes through the-perforations -2 l :in a bars: ['2 while the ;reduced portion .20 passes through: azcentral opening inma washer -2 2. 'fI-lhe :outer ends :of r the reduced portions. are:-:swa;ged r 5 overtoa. maintain the-roller it in position. The disposition: of thew-rollers maintains portions -of the peripheries of'itheinnerfaces ofsaidrrollers or cutters insubstantial--contact. as shown :at: 23. y "The" mounting ofzthese cutters is such-thatgthey 9 willff reely revolveon the, axle l'l:when the-head is being forced through a sewer.

I A" :,hi'zil-low -shank, "generally designated :;by 513118 numeral fi extends through and. isrigidly con- *nectedtothebase H of thesupport' lll. (Surrounding its *prOjBCt'iIlg end and-lying :against the 'inner'faceof' the base I lie a'ring or washer '25 -whi'ch--is'-held in place in suchamannenas "to allow theheadto freely-rotate.

v "A pair of stationary cutters 36 are secured to the side walls of the shank or sleeve 25 and are diametrically disposed with respect to each other. Ihe-Illn81 edge of each cutter is rounded and sharpened as shown at 3|. The cutters 30 act as guards for the rear edges of the cutters l5 so that wherig the head is being withdrawnit will not be hungiii p on sharp edges or defects on the inner surfaces of sewer pipes.

At the forward end of tl e sewer rod ts a connecting member 32 having shoulder 33 engag g the outer or rear end of the sleeve 25 and a ylindrical portion which extends through and projects beyond the inner end of the sleeve 3whereit is provided with a transverse perfora- ;i ti'on which receives a. cotter pin for Wedge SS. The latter bears against the inner end of the pin 34. This flat bar is provided with perforations alined with perforations on the outer flat end 4| of a sewer rod 42. Bolts 53 are received by the alined perforations in'members 40 and 4|, and nuts 44 draw the bolts up tight for securing the head to the sewer rod 42.

Inspection of the cutters l5 will show that they are formed by a plane cutting a sphere or spheroid at points between a pole and the center of the sphere to form a section which is less than a hemisphere in order to provide sharp cutting surfaces for the members it along their peripheries.

An inspection of Fig. 1 will show that the inner fiat surfaces l6 of the cutters l5 are located at such an angle that the outer curved surfaces 24 of the cutters almost form a perfect circle where the outer ends of thecutters are associated as shown at 23, so that the head appears slightly pointed whereby the head may be readily pushed around bends and through obstructions in a sewer, with the sharp cutting edges of the members I5 set at divergent angles in order to cut grease and the other obstructions.

The connections between the member 32 and i the support ill is such that the head is swiveled on the conhecting member 32, and is free to rotate thereon. In other words, the wedge 36 will maintain the head on the member 32, but will not bind the sleeve 25 to the pin 34.

The blades 33 are not only welded to diametrically opposite pointson the sleeve 25, but the outer ends of these blades are likewise welded to the inner face of the base ll of the support Ill. These blades not only form knives for cutting through obstacles when the head is withdrawn, but they serve to reinforce the connection between the sleeve 25 and the base I l of said support. If desired, the sharp cutting edges 3| may be omitted, still allowing the blades to act:

in guiding the head when being withdrawn around pipe bends or obstructions on which the rear edges of the cutters might engage.

The construction shown in Fig. 3 is substantially identical "with that shown in Figs. 1 and 2,

except that a modified form of'the connecting head member .for the sewer rod is employed.

In Fig. 3 I have shown a simplified means of attachment between the sewer rod and the head which differs from that previously described in ,that provision for the swiveling action of the .head is omitted. In this structure the base ll of the support is slotted centrally to receive a finger 41 on the plate 48. The latter has wings 49 abutting and welded to the underside of base ,1! the edges 50 of which are curved and sharpened, their outer points lying in a position to guard the contiguous edges of the cutters I5 when the head is being withdrawn. A tail piece 5| on plate 48 provides means of attachment to the sewer rod 42, as by means of bolts 52.

In the modification illustrated in Fig. 4, I have shown frusto-conically shaped cutters 69 rotatably mounted on axles l'l, carried by the inclined side walls 62 of a support 63. The

peripherial edges 6i of these cutters are particu larly sharp due to the shape of the cutters. As in the modification shown in Fig. 1, the blades 30 are attached to the base portion of the support 53 by welding, as indicated at 61.

The swivel mounting for the head comprises the pin in the sleeve the former having the enlarged threaded end 64 adapted to be screwed into a complementary socket on one end of a spiral or coil spring sewer rodjas will be understood.

It'will be understood that the different form of cutters which are used on the heads may be employed alternately as conditions encountered in different operations may require.

I claim:

A head for sewer rods comprising a triangularly shaped support, a circular roller having a cutting edge at its periphery and rotatably mounted on each side of the support so that portions of the cutting edges of the rollers will always be in substantial contact with each other forwardly of the support, a collar extending through the base portion ofthe triangularly shaped support and a blade secured to the rearward side of said base portion and extending to said cutting edges at their rearward portion.

ANTON P. KJERULFF.

' file of this patent:

UNITED STATES PATENTS 2,328,093 Osborn et a1 Aug. 31, 1943 

